Steam-boiler and stay-bolt for same.



B. E. D. STAFFORD. STEAM BOILER AND STAY BOLT FOB- SAME.

APPLICATION FILED 00w. 1, 1909.

984,862. PatensadFeb. 21, 1911.

2 BKEETS-SHBBT 1.

TNESSES 1' w! INVENTOR A lt orney B. E. D. STAFFORD. STEAM BOILER ANDSTAY BOLT FOR SAME.

APPLICATION FILED OUT. 1, 1909.

I 3136111366. Feb. 21, 1911.

2 SHEETS-SEEET 2.

I gjQ/VE/VTOR v and it consists in providing the roof sheet of theboiler- 'wlth raised seats or bosses, the

.sheets connected by my ftlexible stay bolts.

- bolt uountecl in a sleeve secured toa raised outer face of the seatwill be approximately nurrnn STA l ES ra rnn r enrich.

BENJAMIN D. STAFFQR D, OF PITTSBURG, PENNSYLVANIA. ASSIGNOR T0 PLANNER?BOLT COMPANY, OF PITTSBUEi-G, PENNSYLVANIA.

STEAM-BOILER AND STAY-BELT FOR SAME.

Application filed Octobeni,

Specification of letters Patent. Patented! Felt). 21

1969. Serial No. 520,543.

To all whom it may concern:

-Be it known that I, BENJAMIN E. D. STAQ- ronn,.of Pitts-burg, in thecounty of i\llti-: gheny and State of Pennsylvania, have in". ventedcertain new and useful Improvements in Steaui-llngineBoilers andStay-Bolts for Same and I do hereby declare the following to be a full,clear. and some description of the invention,-. such as will enableothers skilled in the art to whichitappertaius to make and use. thesame. v My invent-ion relates to an improvement in steam ienginef'hoilcrand stay bolts t'or same.

outer facesfot which are substantiallygat right angles to the long axesof the stay bolts, thereby enabling the seats to be more perfectlyprepared to'receive the sleeves of the stay bolts. and obtainingcontinuous threads which insure steam tight connection between theparts.

In the accompanyingdrawings, Figure 1 is a viewin section of a portionof a locomotive boiler showing the roof and crown Fig. 2 is an enlargedview of one stay bolt. showing its connection withthe sheets, the sleeveand nut being shown in section and the holt'broken away at. its centerFig. 3 is a view in section showing the. Tate flexible seat. Fig. at isa plan view ofa portion of Fig. 1 and Fig. 5 is a view showing the usualmethod of attaching the stay bolt 'to the roof sheet. I

1 represents the-roof sheet and 2 the crown sheet connected by the boltsIn the present instance I have shown in Fi 1, the roof sheet composed ofa double thickness, the in-' nor plates 1 being riveted to the outerplates as clearly shown in Fig. 1. This roof ,sheet, or -the outerplates 1 of the roof sheet, is provided at certain. points, with seats4:" which latter project outwardly from the sheet, and are formedbyforcing the metal, by (lies or'otherwise outwardly as shown-in Fig. 2.'The height of the seat, depends a1: together on its location on the roofsheet, but in each instance the height is such that the at rightangles't'o the long diameter of the bolt Slpassing' through same. Insome .situa tious as at A, where the stay bolt is int an.

formed in the seat.

. figure.

line at right angles to the inner face. of the root sheet. the scat 4must be raised considerably. whereas with another, say bolt 13,

where the latter stands at an angle of aboutv seven degrees from a rightangle. the height of the seat is much less. in each instance'the seat isof an area sut'ueieut to receive the sleeve 5, which latter is screwthreaded externally andis screwed into a threaded hole This sleeve issubstantially ot' the shape and construction shown in the Tate lateutX0. 753.329 granted March 1st, 1904. and forms a support for the spherisca] not (i. which constitutes the head of the bolt 3. 'i his nut is asphere with flattened ends, the threaded bore extending from one fiatend to the other. to receiv e the threaded ienti ofthe bolt 3. 1 screwedhome into the nut. or the nut "screwed onto the bolt, the head of thelatter After the bolt has been is upset or riveted nver the uperfiattened end of the nuhthus locking tie bolt to the nut as shown inFigs. 2 and 5. This spherical nut rests on the curved seat 7 formed inthe sleeve. and has a free rocking movement;- therein, the lower end ofthe sleeve 5. below the head being flared to allow the bolt to have suchfree movement- The lower end of the bolt may be sccuremcto the crownsheet by screw threads and then upsetas shown at 8 in Fig. 1. or theymay he provided with button heads as shown at 9- in the same 7 The outerend of the sleeves are closed by the caps screwed to the externallythreaded ends of the sleeves- In the construction shown in Fig. 3,-the

correct angle for each row of staybolts therebv insurin seats at rightarmies to the stav m t. Z? s bolts; which can be readily machined, and

which permit of continuous threads for securing the sleeves to thesheet.

In the present methods of securing the fleiiible stay bolt sleeve to theroot sheet of a locomotive boiler, the extreme angles in some locations,as at A in' Fig.1 and also in Fig. 5, do not provide for continuousthread engagement betweerrthe sleeve and sheet, consequently allowingsteam and water to follow the threads left open, and eventually leakingwhen the parts corrode. Again, in applying the bolts all machiningoperatimis' shown but,

nentor rigid supports, hence it is quite impossible to secure a perfectfit between all the'b'olts and the roof sheet. By providing the roofsheet with raised seats, I overcome the above objections and cantemployshorter sleeves 5, than can be employed directly in the curved shell ofthe boiler.

By this improvement the stay bolts have free movement -to cope with thedifferences in expansion of'the crown and roof sheets, and renders theboiler more safe and scrviceahle.

It is evident that manv slight. changes might be resorted to in therelative arrangenient of parts shown and described without departingfrom the spirit and scope ot'niy f sheets the fol-liter having a raisedseat. the

invention hence I would have it understood that-l dtt not wish toconfine myself to the exact construction and arrangement of partsHaving-fully described my invention .what I claim as new and desire tosecure by Letters-Patent, is:

1. The. combination with the roof and crown sheets of a boiler, the roofsheet being; provided with raised seats, of sleeves removably secured insaid seats, and stay bolts and provided with heads which are looselymounted in the sleeves In the roof sheet. V

9. 'IlleCOlltlJliltltlOIl with root and crown sheets of a boiler, theroof sheets having raised seats, the outer faces'of which are ap n'oxinately at right angles to the stay bolts, of sleeves screwed into saidseats and stay bolts secured to the crown sheets and bro vided withrounded heads loosely mounted in the sleeves in the roof sheet.

3. The combination with roof and crown sheets of a boiler the roof sheethaving a series of raised seats the outer faces of which areapproximately at right angles to the stay bolts, of sleeves screwed intosaid raised seats and stay. bolts secured to the crown sheet andprovided with rounded heads screwed onto the ends'of the bolts andseated in the sleeves; I a

l. The combination with roof and crown outer face of-which isapproximately at right anirlcs to the stay bolt, and a sleeve screwedinto said seat. of a sta boll sc- Cured to the crown sheet, a roundedhead screwed to the upper end of the stay bolt a1 resting on a; curvedseat in the sleeve and a cap closing the upper end of the sleeve.

In tcstin'lony whereof, I have signed this specification in the prescnu'of two subscribing witnesses.

BENJAMIN E. D. S'IAl htllil).

Witnesses :t i

Bowls S. Bron, 'WM. 1*. McNAms.

